function x = genlogistic_cdf_inv ( cdf, a, b, c )

%*****************************************************************************80
%
%% genlogistic_cdf_inv() inverts the Generalized Logistic CDF.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    12 January 2021
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    real CDF, the value of the CDF.
%    0.0 <= CDF <= 1.0.
%
%    real A, B, C, the parameters of the PDF.
%    0.0 < B,
%    0.0 < C.
%
%  Output:
%
%    real X, the corresponding argument.
%
  if ( cdf <= 0.0 )
    x = - Inf;
  elseif ( cdf < 1.0 )
    x = a - b * log ( cdf^( - 1.0 / c ) - 1.0 );
  elseif ( 1.0 <= cdf )
    x = Inf;
  end

  return
end
